buildtools/chkincs: test headers for C++ compatibility

Add support for checking each of our headers for issues when included in
a C++ file.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.c

buildtools/chkincs: test headers for C++ compatibility

Add support for checking each of our headers for issues when included in
a C++ file.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

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